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It is assumed that we are dealing with a closed system—no loss of either parent or daughter elements has occurred since the study material formed.No scientist can guarantee that any sample can be considered a closed system unless it was isolated from its environment when it was formed.Elements can be transported into a sample or leach out of a sample.Scientists will reject theories about the age of the earth that do not conform to the norm.Carbon-14 comes from nitrogen and is independent of the carbon-12 reservoir.If even a small percentage of the limestone deposits were still in the form of living marine organisms at the time of the Flood, then the small amount of carbon-14 would have mixed with a much larger carbon-12 reservoir, thus resulting in a drastically reduced ratio.A rock sample from Nigeria was dated at 95 million years by the potassium-argon method, 750 million years by the uranium-helium method, and less than 30 million years by the fission-track method.

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The current high rate of entry might be a consequence of a disturbed post-Flood environment that altered the .

A further example from a lava flow off the coast of Hawaii shows similar discrepancies.